THE FINISHED DEPTH OF FIELD CALCULATOR, WITH A SIMULATED METALIZED GRAPHICSBRIEF DISCRIPTION AND AD FOR MY DEPTH OF FIELD CALCULATOR
NOTICE: The "HOW TO" article, along with the peel and stick graphics, that are offered for sale here have been placed on record at the Library of Congress. The conceptual idea has been filed with the U.S. Patent Office, APPLICATION NUMBER 60/072,753, with foreign filing license granted.
WORLD MANUFACTURING RIGHTS ARE NEGOTIABLE
Three friends and yourself are on a photographic outing, all using 35mm camera’s *. Each of you are using a different focal length lens and f-stops, while photographing subjects at various distances. Only one person has a DEPTH OF FIELD scale on their lens, but you have the DEPTH OF FIELD Calculator, carrying extra rolls of film today.
Joe calls out to you, "50mm lens, f-8 at 15 feet" and in less than 5 seconds you call back, "Near distance is 11 feet and far distance is 23 feet.' Next Pete calls out, "200 mm, f-22 at 30 feet", your reply "26 feet to 38 feet" and then you check your own DEPTH OF FIELD for your close-up shot: 28mm, 5 feet at f-22 ===> 2.4 feet to 10 feet.
All of these responses were a quick and simple calculation on the DEPTH OF FIELD Calculator. Slide the distance ring to the subject distance, rotate the ring and match the subject distance and read the near distance focal point. Subtract the near distance from the subject distance, double it and add that number to the subject distance for the far distance. The DEPTH OF FIELD Calculator is a hybrid, three axis slide rule (see photograph).
THE FINISHED DEPTH OF FIELD CALCULATOR, WITH A SIMULATED METALIZED GRAPHICS
For complete instructions on how to make this handy DEPTH OF FIELD Calculator, the parts list for the half a dozen or so items you may need to pick up at the hardware store and the peel and stick graphics charts, send a self addressed, stamped ($0.78 for 3 ounces), envelope (9" X 12") and a check for $X.XX. For extra peel and stick copies of the graphic charts **, they are available for only $X.XX each. Add additional postage of $0.23 per set, up to an additional 9 sets, For orders requesting the INSTRUCTIONS AND TEN (10) EXTRA SETS OF GRAPHICS, I"LL PAY THE POSTAGE. Wisconsin residence please add 5.5% State and County (La Crosse) Sales Tax.
MAIL TO:
Gerald A. Bonsack
N6261 Jason Street
Onalaska, Wis. 54650-9720
* The peel and stick graphics were developed for 35mm cameras. Peel and stick graphics for 645, 6X6, 6X7 and other film format can be generated if there is sufficient interest. If you want graphics for other film sizes, please send me an e-mail message or a postcard stating film size and your address for notification if the graphics desired is generated.
** Graphics are printed on a reflective surface material making them impossible to photocopy.